The following bug has been logged online:

Bug reference:      3813
Logged by:          Nguyen Hoa Phong
Email address:      [EMAIL PROTECTED]
PostgreSQL version: 8.3-beta4
Operating system:   Windows
Description:        PGDLLIMPORT conflict
Details: 

Because of PGDLLIMPORT conflict and so to use palloc we must to declare
(copydir.c):

/*
 *      On Windows, call non-macro versions of palloc; we can't reference
 *      CurrentMemoryContext in this file because of PGDLLIMPORT conflict.
 */
#if defined(WIN32) || defined(__CYGWIN__)
#undef palloc
#undef pstrdup
#define palloc(sz)              pgport_palloc(sz)
#define pstrdup(str)    pgport_pstrdup(str)
#endif
...

But it's the same if we use the other functions of system, such as, SPI
variables (SPI_result, SPI_tuptable, SPI_lastoid, SPI_processed,...),...
So I think that maybe we should have more one define for this:

#if defined(WIN32) || defined(__CYGWIN__)
 #define PGDLLIMPORT __declspec (dllexport)
#endif

And so, the using the relations functions (palloc,..) are normal.

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